unitedhealthcare. i get congested. but now, with zyrtec-d®, i have the proven allergy relief of zyrtec®, plus a powerful decongestant. zyrtec-d® lets me breath freer, so i can love the air. [ male announcer ] zyrtec-d®. behind the pharmacy counter. no prescription needed. >> pelley: south africa's government said today nelson mandela has a lung infection but is responding to treatment. mandela's 94-- he's been in the hospital since saturday. the former president's history of lung problems began during the 27 years that he was in prison for leading the antiapartheid movement. federal education researchers said today that elementary school students in this country have improved their science and math scores, but they're still behind some countries, especially in asia. south korean fourth graders topped the science list with the united states in seventh place. in math, singapore is number one while american fourth graders ranked 11th. while there's no lack of science or math at the air force, apparently. at cape canav